NCCER Plumbing Level 1 - Questions and Answers Type K copper tube is marked with the color code Green The valve most often used for draining and freeze p... [Show More] rotection above ground is the Compression, stop, and waste valve The type of cable also known as a ground key is the Stop valve In order to prevent turbulence when more than one tee is installed in a line, a tube should have a minimum of 30" of tube between tees If tee fittings are not properly installed, they can cause a condition known as Bullheading To measure a tube that had a fitting on one end only, use a End-to-face measurement The preferred tool for cutting tubing is a Handheld cutter When using a mechanical bender, the minimum bend radius of 1/4" annealed tubing is 3/4" Compared to the tubes they are joining, solder fittings are Slightly larger Structural site components to support the vertical load of the tube are attached using Tube riser clamps The part of the hanger that links the tube itself to the structural attachment that e called a Connector The ___________of the hanger links the tube attachment to the structural attachment C-clamps Which of the following is not a requirement of insulation for copper tubing Corrosion-resistant Flare joints are required in an installation where _______hazards exists Fire A hacksaw blade should have how many teeth per inch 32 To pressure test a dwv system, a plumber should fill the vent stack woth Water When creating cast-iron pipe and fittings, manufacturers use a process involving Molten pours in molds Which of the following statements about cast-iron is true? For a given nominal pipe size, SV pipes have the thinner walls than XH pipes. How many degrees does a 1/5 bend change the direction of the flow? 72° Tees are typically dimensioned with two numbers, such as 4x2-1/2. The first number indicates The diameter of the straight-through opening Which off the listed fittings is permitted only in horizontal-flow to vertical-flow applications Sanitary tee To connect a length of pipe to another of a different size, use an Increaser When preparing for a cast-iron plumbing job you should Organize pipe and fittings into groups by size and type When measuring the length of a long, straight run of cast-iron hub-and-spigot pipe, the total length of the pipe required is equal to the run Measurements plus the insertion length times the number of laying length required When inserting the spigot end of cast-iron pipe into a hub, you should Pull the pipe into the hub using a puller tool When using a torque wrench, do not tighten the clamps before ensuring the correct placement of the Coupling Which of the following statements is true about the metals used for plumbing pipes? Manganese is often added to a carbon steel during smelting to improve strength Proper storage and organization of plumbing materials at the work site significantly increase Your Productivity Thread engagement refers to the length of pipe that screws into a fitting The inside diameter ID of 2 inch, nominal, schedule 80 pipe compared to schedule 40 of the same pipe size is Smaller Bundles of steel pipe are labeled with tags that identify The ASTM A53 standard Fittings with recessed threads that are used only on soil and waste piping systems are called Drainage fittings Which of the listed fittings are used to close open-ended pipes Caps A globe valve is most effective for which of the following purposes in a plumbing system? Providing precise control of flow When measuring pipe, your pipe will be cut too short unless you take into account it's Thread engagement When measuring pipe before cutting and threading it, which Method would be best when the pipe the pipe section has fittings threaded on both ends Center-center Which of the following tools listed would be the best for turning a small-diameter black-iron pipe while threading it into a fitting Chain wrench Which of the following statements about cutting threads on a pipe is not true Frequently wipe off chips with your bare hands to check for smoothness of the cut. The first step in joining a threaded carbon steel water pipe to a fitting is applying pipe- joint compound or tape When joining grooved pip, the plumber must Make sure that no part of the gasket extends into the grooves A hanger that touches or connects directly to the pipe itself is called an [Show Less]
